WordPress 3.0 “Thelonious” Available Now

Major new features in this release include a sexy new default theme called Twenty Ten.

Theme developers have new APIs that allow them to easily implement custom backgrounds, headers, shortlinks, menus (no more file editing), post types, and taxonomies. (Twenty Ten theme shows all of that off.) Developers and network admins will appreciate the long-awaited merge of MU and WordPress, creating the new multi-site functionality which makes it possible to run one blog or ten million from the same installation.

As a user, you will love the new lighter interface, the contextual help on every screen, the 1,217 bug fixes and feature enhancements, bulk updates so you can upgrade 15 plugins at once with a single click, and blah blah blah just watch the video. (In HD, if you can, so you can catch the Easter eggs.)

Congratulations guys. I am so happy with this announcement, and rather proud of you all. I've been around since 1.2
(i think?)
came out, which isn't exactly the beginning, but it was so just the beginning. So much so that I was actually implementing *inside* my own framework I was building. Eventually, you guys brought it to the point where I simply moved on to an all-wp implementation, and my life has been sweeter ever since.

Now with version 3.0, it's like watching a child you watched grow up finally graduate high school *sniff*

I updated my blog to latest wordpress 3.0 version and first thing which I noticed is change in the dashboard layout.
After that I activated the network settings to let my blog behave like MU.
So far I have not seen any known issue apart from Google Xml sitemap plugin showing error when I enabled multi-site option.
I’m waiting to see a quick update for Google Xml sitemap plugin, so that it can work without any issue with multi-site,or else any better alternate plugin.

Is WP 3.0 available for both WordPress.com and WordPress.org? Also, if using WordPress.com is this part of the automatic upgrade or are bloggers responsible for downloading the software upgrade on their own?

@tina — WordPress.com is running WordPress 3.0 in multi-site mode. Automattic takes care of maintaining and always updating the code for WordPress.com – often daily — so there is no need for manual upgrades.